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authorLinus Torvalds <torvalds@linux-foundation.org>2022-03-24 22:30:37 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-03-24 22:30:37 +0300
commit66711cfea642a162bc99abdefe1645b26dbd778f (patch)
tree9f158a0577dc8375a8a5835441c592919bb628ea /include/uapi
parent1ebdbeb03efe89f01f15df038a589077df3d21f5 (diff)
parenteeda29db98f429a3b6473117e6ce1c213ab614f2 (diff)
downloadlinux-66711cfea642a162bc99abdefe1645b26dbd778f.tar.xz
Merge tag 'hyperv-next-signed-20220322' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux
Pull hyperv updates from Wei Liu: "Minor patches from various people" * tag 'hyperv-next-signed-20220322' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: x86/hyperv: Output host build info as normal Windows version number hv_balloon: rate-limit "Unhandled message" warning drivers: hv: log when enabling crash_kexec_post_notifiers hv_utils: Add comment about max VMbus packet size in VSS driver Drivers: hv: Compare cpumasks and not their weights in init_vp_index() Drivers: hv: Rename 'alloced' to 'allocated' Drivers: hv: vmbus: Use struct_size() helper in kmalloc()
Diffstat (limited to 'include/uapi')
-rw-r--r--include/uapi/linux/hyperv.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/uapi/linux/hyperv.h b/include/uapi/linux/hyperv.h
index daf82a230c0e..aaa502a7bff4 100644
--- a/include/uapi/linux/hyperv.h
+++ b/include/uapi/linux/hyperv.h
@@ -90,6 +90,17 @@ struct hv_vss_check_dm_info {
__u32 flags;
} __attribute__((packed));
+/*
+ * struct hv_vss_msg encodes the fields that the Linux VSS
+ * driver accesses. However, FREEZE messages from Hyper-V contain
+ * additional LUN information that Linux doesn't use and are not
+ * represented in struct hv_vss_msg. A received FREEZE message may
+ * be as large as 6,260 bytes, so the driver must allocate at least
+ * that much space, not sizeof(struct hv_vss_msg). Other messages
+ * such as AUTO_RECOVER may be as large as 12,500 bytes. However,
+ * because the Linux VSS driver responds that it doesn't support
+ * auto-recovery, it should not receive such messages.
+ */
struct hv_vss_msg {
union {
struct hv_vss_hdr vss_hdr;